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Plik ir.vhd:

-- IR - rejestr instrukcji
-- rejestr, w którym przechowywana jest
-- bieżąca instrukcja mikrokontrolera pobrana z pamięci.
library ieee;
use ieee.std_logic_1164.all;

entity ir is
port (
clk : in std_logic; -- zegar z przy
addr_bus : in std_logic; -- na magistrali część instrukcji
load_ir : in std_logic; -- wczytanie danych z magistrali
sysbus : inout std_logic_vector(7 downto 0); -- do ir
op : out std_logic_vector(2 downto 0); -- trzybitowy kod operacji
);
end entity ir;

architecture arch of ir is
-- Rejestr instrukcji
signal ireg: std_logic_vector(7 downto 0) := (others => '0');

begin
-- Na magistrali część instrukcji z ir reprezentująca operand
sysbus <= "000" & ireg(4 downto 0) when addr_bus = '1' else (others => 'Z');
-- Trzybitowy kod operacji
op <= ireg(7 downto 5);

process (clk, rst) is
begin
if rst = '0' then
ireg <= (others => '0');
elsif rising_edge(clk) then
if load_ir = '1' then
ireg <= sysbus;
end if;
end if;
end process;
end architecture arch;
     
 
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